levene.test {s20x}

Levene test for the ANOVA Assumption

Description

Perform a Levene test for equal group variances in both one-way and two-way ANOVA. A table with the results is (normally) displayed.

Usage

levene.test(formula, data, digit = 5, show.table = TRUE)

Arguments

formula

a symbolic description of the model to be fitted: response ~ fac1 + fac2.

data

an optional data frame containing the variables in the model.

digit

the number of decimal places to display.

show.table

If this argument is FALSE then the output will be suppressed

Value

A list with the following elements:

df

degrees of freedom.

ss

sum squares.

ms

mean squares.

f.value

F-statistic value.

p.value

P-value.

See Also

crossFactors, anova.

Examples

##
data(computer.df)
levene.test(score ~ factor(selfassess), computer.df)